The argument there is that you should probably have looked at a workstation CPU and board, e.g. ThreadRipper.
As I mentioned in the "Slots vs. Lanes" section in the article, most home users don't actually need more lanes -- just more slots.
Indeed. I really don't understand why they can't have x16 slots instead of those useless x1 slots.
My current motherboard has two PCIe x1 slots, running either 3.0 or 4.0. Plenty of bandwidth for lots of stuff. But they're useless because every expansion board has a x4 or larger connector. Previous motherboards have been full of useless x1 connectors as well.
I know there are exceptions, but x1 is certainly the norm.